added a plus to permalink

test/source/+/foo.md

@@ -1,6 +1,7 @@
 ---
 layout: default
 title : Page inside +
+permalink: plus+in+url
 ---
 Line 1
 {{ page.title }}

test/test_page.rb

@@ -127,13 +127,13 @@ class TestPage < Test::Unit::TestCase
         assert File.exists?(File.join(dest_dir, 'contacts.html'))
       end
 
-      should "write even when the folder name is plus" do
+      should "write even when the folder name is plus and permalink has +" do
         page = setup_page('+', 'foo.md')
         do_render(page)
         page.write(dest_dir)
 
         assert File.directory?(dest_dir)
-        assert File.exists?(File.join(dest_dir, '+', 'foo.html'))
+        assert File.exists?(File.join(dest_dir, '+', 'plus+in+url'))
       end
 
       should "write properly without html extension" do